PS. More links! There's The Salvation Army web site, with an option to donate specifically for Oklahoma Tornado Relief (or text STORM to 80888). In addition, Oklahoma Baptist Disaster Relief is already mobilized and in Moore, and it guarantees 100% of donations will go directly to the relief efforts underway.

The Salvation Army is what they're advising most strongly up here for donations, above the red cross, because they have ties to many local organizations wherever they work. And disaster aid is one of the areas where I trust the Sally Ann to be right in there.